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Various practical applications of the average (A) and difference (D) of Friedel opposites are described. Techniques based on the resonant‐scattering contribution to Friedel differences are applied to see whether a crystal is centrosymmetric or not, and to determine the point group of the crystal. For the validation of a structural study, plots of Aobs against Amodel, and Dobs against Dmodel are used...
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